code: def execute(self, argv):
      self.show_in_help = True
      self.description = (
          "Start Module Serving or Bert Service for online predicting."
      )
      self.parser = argparse.ArgumentParser(
          description=self.__class__.__doc__,
          prog="hub serving",
          usage="%(prog)s",
          add_help=True,
      )
      self.parser.add_argument("command")
      self.parser.add_argument("sub_command")
      self.parser.add_argument("bert_service", nargs="?")
      self.sub_parse = self.parser.add_mutually_exclusive_group(
          required=False
      )
      self.parser.add_argument(
          "--use_gpu", action="store_true", default=False
      )
      self.parser.add_argument(
          "--use_multiprocess", action="store_true", default=False
      )
      self.parser.add_argument("--modules", "-m", nargs="+")
      self.parser.add_argument("--config", "-c", nargs="?")
      self.parser.add_argument("--port", "-p", nargs="?", default=8866)
      self.parser.add_argument("--gpu", "-i", nargs="?", default="0")
      self.parser.add_argument(
          "--use_singleprocess", action="store_true", default=False
      )
      self.parser.add_argument(
          "--modules_info", "-mi", default={}, type=json.loads
      )
      self.parser.add_argument(
          "--workers", "-w", nargs="?", default=number_of_workers()
      )
      try:
          self.args = self.parser.parse_args()
      except:
          ServingCommand.show_help()
          return False
      if self.args.sub_command == "start":
          if self.args.bert_service == "bert_service":
              ServingCommand.start_bert_serving(self.args)
          else:
              self.parse_args()
              self.start_serving()
      elif self.args.sub_command == "stop":
          if self.args.bert_service == "bert_service":
              log.logger.warning(
                  "Please stop Bert Service by kill process by yourself"
              )
          elif self.args.bert_service is None:
              self.stop_serving(port=self.args.port)
      else:
          ServingCommand.show_help()
  
imports: import argparse
  import os
  import platform
  import json
  import multiprocessing
  import time
  import signal
  import paddlehub
  from paddlehub.commands import register
  from paddlehub.serving import app_compat
  from paddlehub.env import CONF_HOME
  from paddlehub.serving.http_server import run_all, StandaloneApplication
  from paddlehub.utils import log
  from paddlehub.utils.utils import is_port_occupied
  from paddlehub.server.server import CacheUpdater
label_desc: Use image node_id 12 for calling the ServingCommand obj's underlying member method code with example usage: obj.execute(argv) and returns: False